${{key}}
<input type=text name=cell 
  class="${typeof value === "number" ? 'number' : ''}"
  value="${editFormula ? (formula||value) : !isUnset(value) ? value : EMPTY}" 
  onchange=Recalculate 
  ondblclick=ShowFormula
  oncontextmenu=ShowFormula
  onfocusout=ShowValue
>
